user/sven/linux.git/arch/arc/include/asm/bitops.h, branch v3.18.32Linux Kernel
https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=v3.18.322015-07-05T14:12:50ZARC: add smp barriers around atomics per Documentation/atomic_ops.txt2015-07-05T14:12:50ZVineet Guptavgupta@synopsys.com2014-11-20T10:12:09Zurn:sha1:e965e3a11b9ef79678a55fcad8a025e98acd2eee
[ Upstream commit 2576c28e3f623ed401db7e6197241865328620ef ]
- arch_spin_lock/unlock were lacking the ACQUIRE/RELEASE barriers
Since ARCv2 only provides load/load, store/store and all/all, we need
the full barrier
- LLOCK/SCOND based atomics, bitops, cmpxchg, which return modified
values were lacking the explicit smp barriers.
- Non LLOCK/SCOND varaints don't need the explicit barriers since that
is implicity provided by the spin locks used to implement the
critical section (the spin lock barriers in turn are also fixed in
this commit as explained above
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
ARC: remove extraneous __KERNEL__ guards2014-10-13T09:16:20ZVineet Guptavgupta@synopsys.com2014-09-27T07:19:11Zurn:sha1:be64c997d96dd29029ed40d9df9cbf80fa1c7ed4
Verified by doing make headers_install as none of these files are
exported to userspace
arch,arc: Convert smp_mb__*()2014-04-18T09:40:31ZPeter Zijlstrapeterz@infradead.org2014-03-12T16:11:00Zurn:sha1:d594ffa94b7efdd8c6da5ee48aea8ae229809b55
The arc mb() implementation is a compiler barrier(), therefore it all
doesn't matter one way or the other. Simply remove the existing
definitions and use whatever is generated by the defaults.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-ua48a59wri3ybz1rz8i7uvbr@git.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
ARC: Atomic/bitops/cmpxchg/barriers2013-02-11T14:30:30ZVineet Guptavgupta@synopsys.com2013-01-18T09:42:16Zurn:sha1:14e968bad788de922a755a84b92cb29f8c1342e4
This covers the UP / SMP (with no hardware assist for atomic r-m-w) as
well as ARC700 LLOCK/SCOND insns based.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>